1.词形不变,词性改变.例如:work,study,water,plant等可以用作动词,也可以用作名词.
2.一些动词在词尾加上-er或-or之后就变成了表示“某一类人”的名词.例如:work—worker,teach—teacher,sing—singer,jump—jumper,play—player,learn—learner,visit—visitor,invent—inventor等.
注意:1)以不发音的e结尾的动词,在词尾加-r.例如:drive—driver,write—writer等.
2)以重读闭音节结尾,且末尾只有一个辅音字母的动词,应双写末尾的辅音字母,再加-er.例如:run—runner,win—winner,begin—beginner等.
3.在动词词尾加-ing变成名词(方法与动词变为现在分词的方法相同).例如:meet—meeting,build—building,wait—waiting,wash—washing,swim—swimming,shop—shopping,begin—beginning等.